docudb::query::binary_op Struct Reference

Represents a binary operation for querying. More...

#include <docudb.hpp>

Inheritance diagram for docudb::query::binary_op:

Public Member Functions
	binary_op (std::string const &json_query, std::string const &op, db_value &&value)
	binary_op (std::string const &json_query, std::string const &op, nullptr_t)
std::string	to_query_string () const
binder const &	get_binder () const
binder &	get_binder ()

Detailed Description

Represents a binary operation for querying.

Definition at line 243 of file docudb.hpp.

Constructor & Destructor Documentation

binary_op() [1/2]

docudb::query::binary_op::binary_op ( std::string const & json_query, std::string const & op, db_value && value )

inlineexplicit

Definition at line 245 of file docudb.hpp.

                                  : var_(json_query), op_(op), index_(1 + (++bind_counter % MAX_VAR_NUM))
            {
                binder_.add(index_, std::move(value));
            }

binary_op() [2/2]

docudb::query::binary_op::binary_op ( std::string const & json_query, std::string const & op, nullptr_t  )

inlineexplicit

Definition at line 253 of file docudb.hpp.

                           : var_(json_query), op_(op), index_(-1)
            {
 
            }            

Member Function Documentation

get_binder() [1/2]

binder & docudb::query::binary_op::get_binder ( )

inline

Definition at line 285 of file docudb.hpp.

            {
                return binder_;
            }

get_binder() [2/2]

binder const & docudb::query::binary_op::get_binder ( ) const

inline

Definition at line 280 of file docudb.hpp.

            {
                return binder_;
            }

to_query_string()

std::string docudb::query::binary_op::to_query_string ( ) const

inline

Definition at line 261 of file docudb.hpp.

            {
                auto json_query = var_.size() > 0 && var_[0] == '$';
                auto is_value_null = index_ == -1;
 
                // special case for null value
                if (is_value_null) {
                    if (json_query)
                        return std::format("json_type(body, '{0}') IS NOT NULL AND json_extract(body, '{0}') {1} NULL", var_, op_);
                    else
                        return std::format("[{}] {} NULL", var_, op_);                    
                }
 
                if (json_query)
                    return std::format("(json_extract(body, '{}') {} ?{})", var_, op_, index_);
                else
                    return std::format("([{}] {} ?{})", var_, op_, index_);
            }

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The documentation for this struct was generated from the following file:

• src/docudb.hpp